Finally Corrected Botanical Survey of India SJP Layout.Pmd
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Pharmacognosy of Negative Listed Plants Botanical Survey of India Ministry of Environment and Forests FOREWORD Pharmacognosy, an ancient branch of herbal science, stretched its horizon to be all inclusive of all facets of medicinal plants research. It is well known fact that many of the medicinal plants which possess very effective therapeutic properties have become threatened in the wild, either due to over exploitation or due to loss of habitats as a whole. Such plants have been placed under Negative list of Exports, so as to regulate their trade on one hand and to check unplanned and illegal exploitation from wild sources on the other. Botanical knowledge of the Negative listed plants is necessary to identify them in their crude form when they are illegally traded, exported or smuggled. The present illustrative manual provides information on twenty one Negative listed plants on various pharmacognostic parameters that comprise morphology, organoleptic study, anatomy, scanning electron microscopy, powder microscopy and fluorescence analysis. Dr. A.B.D. Selvam has put in serious efforts to prepare this manual with detailed descriptions and quality microphotographs for all the twenty one species. The epigrammatic diagnostic characters of these species have been provided in a tabular form at the end of this manual, which can be used as ready referance for identification of the enlisted species either in their fresh or dried form. Further, a glossary of botanical and therapeutic terms have also been furnished, which would facilitate quick and easy understanding of the subject especially for those who are not familiar with the terms. This manual is the first attempt of the Botanical Survey to bring out such a publication that has a direct relevance in confirming the correct botanical identity of twenty one Negative listed plants thereby arming the customs officials, crude drug dealers/traders and other concerned stake holders with the needed scientific information to see that these plants don’t pass through various Indian ports under different trade names/dubious names. Kolkata Paramjit Singh Date : 30th Nov. 2012 Pharmacognosy of Negative Listed Plants 171 15. Pterocarpus santalinus L. f. The genus Pterocarpus belongs to the family Papilionaceae, which comprises of about 15 species worldwide and are widely distributed in the Tropics, of which 5 species occur in India. Pterocarpus santalinus is one of the most valuable plant species found in Southern parts of India. Owing to the reddish colour of the heartwood of this plant, it is popularly known as ‘Red sandalwood’. It is otherwise known as ‘Red Sanders’ in trade. Naturally, this plant species is occurring in the tropical dry deciduous forest. However, considering its usefulness and demand in the market, it is described under a separate forest sub-type ‘The Red sanders forest’. This plant is referred to as ‘the pride of Eastern Ghats’. Since the plant species is resistant to drought, it is considered as an excellent species for planting in hot and dry areas of South India (Sanjappa, 1992; Verma et. al., 1993; Pullaiah and Chennaiah, 1997; Prasad & Reshmi, 2003). The heartwood of this plant is heavily impregnated with red dye called ‘santalin’, for which it is valued. It is immune to white ants and other insects and does not require antiseptic treatment. This tree is earning maximum foreign exchange to Andhra Pradesh State government (Anonymous, 1969; Naidu and Mastan, 2001). Etymology: The generic name ‘Pterocarpus’ is derived from the Greek root words, ‘pteron’ means a wing and ‘karpos’ means a fruit, referring to the winged pot or feathery fruits. The specific epithet ‘santalinus’ is derived from noun base ‘Sandal’ and Latin adjectival suffix ‘inus’ means like, which hints that this plant is possessing the characteristics of or resembling to that of Sandal or Sandalwood (Stearn, 1983). Botanical Synonyms: Ligonium santalinum (L.f.) O. Kuntze Trade names: English - Red Sanders; Hindi - Lal-chandan; Sanskrit - Rakta-chandana; Tamil - Sivappu-chandanam; Arabic - Sandal-e- Ahmar; Telugu - Yerra-chandanamu. Distribution: This plant occurs as an endemic species in the hills of Cuddapah, Kurnool, Chittoor, Nellore and Prakasam districts of Andhra Pradesh and sporadically occurring in some pockets of adjoining states of Tamil Nadu and Karnataka at an altitude range of 200 – 900 m (Pullaiah and Chennaiah, 1997). 172 Botanical Survey of India Habit and habitat: A tall deciduous tree; it grows typically on dry, hilly, often rocky ground and is occasionally found growing on precipitous hillsides. It cannot withstand water logging. Phenology: Flowering period from April to July; fruiting period from September to February. Botanical description: Tree, attains a height of 12 m; branchlets glabrous; bark deeply cleft, brownish black. Leaves 3-foliolate, rarely 4 or 5, leaflets ovate-orbicular or oblong, 4.0 – 8.5 x 3.5– 8.0 cm, base obtuse-subcordate, apex emarginated, margin entire. Inflorescence axillary or terminal raceme or panicle. Fruits are pods, orbicular, compressed, narrowly winged along margins, ca. 5 x 4.5 cm. Seed 1, reddish brown (Plate - 62, figures A – C). Field characters: A moderate-sized deciduous tree, bark blackish- brown, deeply cleft into rectangular or square shaped plates (cork cells); bark resembles to that of crocodile’s skin in appearance. Leaflets usually 3, rarely 4 or 5, broadly ovate or nearly orbicular, slightly emarginated, surface glossy. Flowers yellow; pod round with a broad wing. The tree is leafless during January – March. The heartwood of this plant naturally bright orange brown or dark red in colour; upon exposure to air, it turns into very dark brown or black colour. The heartwood is quite heavy and sinks in water (Dutt, 1928; Neginhal, 2004; Sarin, 2008). Plant part used: Heartwood, used in Siddha, Ayurveda, Unani, Tibetian and folk medicines. Medicinal properties and uses: The heartwood of P. santalinus is considered as cooling, astringent, antipyretic, diaphoretic, febrifuge and tonic in action. It is employed in drug formulations used in the treatment of dysentery, bilious affections and diseases of blood. The wood paste is externally applied to cure skin inflammation, headache, fever, scorpion sting, skin diseases and to strengthen eyesight. It has remarkable property of healing pimples, scars, boils, wounds, burnt marks, black spots, eczema and other blemishes of skin. It can make the skin smooth and attractive. A red chemical substance, Santalin present in the heartwood of this plant is used as a dyeing/staining agent. In European medicine, it is used as a colouring agent. It is well known ingredient of French polish (Dutt, 1928; Dey, 1980; Ahmed & Nayar, 1984; Anonymous, 1992; Prasad & Reshmi, 2003; Sheth, 2005; Sarin, 2008). Pharmacognosy of Negative Listed Plants 173 Substitutes and adulterants: Heartwood of Adenanthera pavonina Willd. (Family: Mimosaceae) known as ‘Ranjana’ and ‘Raktakambal’ in West Bengal and ‘Bari Gumchi’ in the Northern parts of India, is often sold as a substitute for Red sanders. Artificially coloured wood shavings and saw dusts of some other trees is also sold in the market as cheap substitutes (Sarin, 2008). Trade details: It is traded illegally in local, regional, national and global markets. The collection of the heartwood of this plant from forests is restricted and is regulated by the forest department. The bulk raw material (heartwood) available in the market is supplied by Andhra Pradesh Forest Department. Supply of smaller amount of this raw material is now obtained from cultivated sources (Sarin, 2008). Major threats: Illegal felling of trees for trade. Current status: This plant species is ranked ‘critically endangered’ due to its restricted natural distribution and depleted population (Sarin, 2008). Conservation and cultivation details: Natural regeneration takes places through seeds. Seeds regenerate satisfactorily under favourable conditions such as loose soil, enough moisture, free from forest fire and animal grazing. For artificial regeneration, one-year old seeds are used. Dry pods (seeds) are collected from the trees and are dried in the sunlight for about 3 days, stored in bamboo baskets or in gunny bags, it can retain viability for 8 to 12 months. To increase germinative capacity, seeds can be pre-treated by soaking them in ordinary cold water for 3 days or immersed in cow dung slurry for 48 hours before sowing. This plant can be raised by direct sowing, in nursery beds, or by stumps. Stump planting gives highest percentage of results. Two-year old seedlings give best results when transferred to the field. It is a highly shade intolerant plant species, it requires plenty of sunlight for proper growth. Large-scale plantations of this tree species have been established in recent years in Andhra Pradesh (Prasad & Reshmi, 2003). Pharmacognostic studies The macroscopic, microscopic, powder, organoleptic characters and fluorescence properties of the heartwood of Pterocarpus santalinus have already been studied (Youngken, 1948; Rao & Purkayastha, 1972; Anonymous, 2001; Billore et. al., 2005; Sarin, 2008). Meanwhile, data available on the macroscopic, powder, organoleptic characters and 174 Botanical Survey of India fluorescence properties of the heartwood of P. santalinus is fragmentary, which requires a detailed study. Further, maceration and SEM (Scanning Electron Microscope) studies have not been carried out so far. Hence, to reconfirm the available data and to provide a consolidated data on the heartwood of this plant, all the above-mentioned parameters have been worked out in the present study. The structural and qualitative data observed in the present study have been furnished below in detail with illustrations, which will be useful in the identification of the heartwood of P. santalinus in its crude form. A) Exomorphic and Organoleptic features The scattered information available on the exomorphic (macro morphological) features and organoleptic characters of the heartwood of P. santalinus were collected and reviewed (Dey, 1980; Shiva et. al., 2002; Khare, 2004; Sarin, 2008). They are furnished in a tabular form along with the personal observations (Table - 29; Plate - 62, figure D).